rpg51

Curious - why Amsoil 75w110? Why not Amsoil 75w90? How do they differ?

Chuck S

It's my understanding the SAE spec changed since our cars were built. I use the bottle on the right.



-- Chuck

flanders

When our S2000 came out there was no SAE110 and the recommended SAE90 had a very large viscosity span.
Here's the numbers for comparison:

• Old SAE90: 13,5 - 24 cSt @ 100°C
• New SAE90: 13,5 - 18,5 cSt @ 100°C
• "New" SAE110: 18.5 - 24 cSt @ 100°C

Jah2000

I use Mobil 75w-140 for the diff (Honda MTF for tranny and Castrol Edge Synthetic for engine). Cost 2x as much as their 75w-90, but you only need 1 bottle anyways. The 140 is supposed to be thicker, more durable, longer lasting, higher torque load and doesn't break down as quickly.

rpg51

Will Amsoil 75w110 make a noticeable difference in fuel economy when compared to Amsoil 75w90?

redlineracing

No.I recommend 110 over 90 for hotter temps.It's what I use in the Carolinas.

\rlr

rpg51

I see.
My car lives in northern New England - Vermont to be specific. It is a three season car. It is sound asleep in winter. It is extremely rare that it is driven below 30F. 95% of the time it is driven in temps in the 40F - 90F range. I'd estimate 75% of the time the temps are 55F to 85F.